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LONG-TERM DEBT - Summary of Components of Long-Term Debt and Capital Leases by Debt Instrument (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | $ 536,772 | $ 555,249
Finance leases maturing through December 2107; bearing interest at a weighted average of 5.2% | 16,510 |
Less - unamortized debt issuance costs | 9,226 | 10,950
Long-term debt and finance leases less unamortized debt issuance costs | 527,546 | 544,299
Less—current maturities of long-term debt and finance leases | 3,571 | 2,298
Long-term debt and finance leases, less current portion | $ 523,975 | $ 542,001
Weighted-average discount rate - finance leases | 5.20% | 5.20%
Revolving line of credit facility ("Revolving Credit Facility") due May 2023; bearing interest at LIBOR plus 1.75% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | $ 43,400 | $ 69,600
Revolving line of credit facility ("Revolving Credit Facility") due May 2023; bearing interest at LIBOR plus 1.75% | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.75% | 1.75%
Secured Debt | Term loan A facility ("Term Loan Facility") due May 2023; bearing interest at LIBOR plus 1.75% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | $ 350,000 | $ 350,000
Secured Debt | Term loan A facility ("Term Loan Facility") due May 2023; bearing interest at LIBOR plus 1.75% | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.75% | 1.75%
Credit Facility |  |
Debt Instrument [Line Items] |  |
Less - unamortized debt issuance costs | $ 5,889 | $ 7,118
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 ("New York Bonds 2014") due December 2044 - fixed rate interest period through 2019; bearing interest at 3.75% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | 25,000 | 25,000
Less - unamortized debt issuance costs | $ 707 | $ 847
Stated interest rate | 3.75% | 3.75%
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 ("New York Bonds 2014R-2") due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | $ 15,000 | $ 15,000
Less - unamortized debt issuance costs | $ 405 | $ 450
Stated interest rate | 3.125% | 3.125%
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 ("FAME Bonds 2005R-3") due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | $ 25,000 | $ 25,000
Less - unamortized debt issuance costs | $ 453 | $ 517
Stated interest rate | 5.25% | 5.25%
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 ("FAME Bonds 2015R-1") due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | $ 15,000 | $ 15,000
Less - unamortized debt issuance costs | $ 569 | $ 622
Stated interest rate | 5.125% | 5.125%
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 ("FAME Bonds 2015R-2") due August 2035 - fixed rate interest period through 2025; bearing interest at 4.375% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | $ 15,000 | $ 15,000
Less - unamortized debt issuance costs | $ 436 | $ 493
Stated interest rate | 4.375% | 4.375%
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 ("Vermont Bonds") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | $ 16,000 | $ 16,000
Less - unamortized debt issuance costs | $ 554 | $ 595
Stated interest rate | 4.625% | 4.625%
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 ("New Hampshire Bonds") due April 2029 - fixed rate interest period through September 2019; bore interest at 4.00% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | $ 11,000 | $ 11,000
Less - unamortized debt issuance costs | $ 213 | $ 308
Stated interest rate | 4.00% | 4.00%
Finance leases maturing through December 2107; bearing interest at a weighted average of 5.2% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases |  | $ 11,248
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.5% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and finance leases | $ 4,862 | $ 2,401
Weighted average interest rate | 3.50% | 3.50%

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